I'd round your 1/3, 1/4, and 1/8 cup from "83-cl", "63-cl", and "31-cl" to 80 cl, 60 cl, and 30 cl, respectively. And in practice, I suspect your 1/2, 1/4, and 1/8 teaspoon would become 2 cl, 1 cl, and 1/2 cl, in stead of "2.5-cl", "1.3-cl", and "0.6-cl", most of the time. (Unless it's something *really* sensitive -- like, say, some very strong spice in a small batch of a dish that's supposed to taste only moderately of that spice.)
So who has the "anal retentive problems" here, Andrew -- me, or you? :-)
OK, only to prove to you that it's still me: WTF is up with the hyphens, in "xx-cl"? What new-fangled linguistic theory says that there should be hyphens there?!?
Otherwise: Very kool, thanks! (I'll try the chakshi-- shackshu-- Tunisian breakfast thingy some time soon. :-)